My experience of HN has varied and my perception of what goes on here is still evolving. But I think a lot of people read the article and do not comment (but may upvote). And I think that different people interact with the site differently. I know I am a statistical outlier for the site on many fronts and I know from previous surveys and discussions that I fundamentally interact with the site differently than the reported "norm." I also am pretty confident that we simply have no real data that could be used to answer this kind of question with real confidence.